<template>
  <el-container class="home-container">
    <!-- 头部区域 -->
    <el-header>
      <div>
        <img src="../assets/logo.jpg" alt="">
        <span>后台管理系统</span>
      </div>
      <el-button type="info" @click="logout">退出</el-button>
    </el-header>
    <!-- 页面主体区域 -->
    <el-container style="margin-top: 60px;z-index: 8;">
      <!-- 侧边栏 -->
      <el-aside :width="isCollapse ? '64px' : '200px'">
        <div class="toggle-button" @click="toggleCollapse">|||</div>
        <!-- 侧边栏菜单区域 -->
        <el-menu background-color="#333744" text-color="#fff" active-text-color="#409EFF"
         unique-opened :collapse="isCollapse" :collapse-transition="false" router :default-active="activePath">
            <!-- 一级菜单 -->
          <el-submenu :index="item.id + '/'" v-for="item in menuList" :key="item.id">
            <!-- 一级菜单的模板区域 -->
            <template slot="title">
              <!-- 图标 -->
              <i :class="iconsObj[item.id]"></i>
              <!-- 文本 -->
              <span>{{ item.authName }}</span>
            </template>

            <!-- 二级菜单 -->
            <el-menu-item :index="'/' + subItem.path" v-for="subItem of item.children"
            :key="subItem.id" @click="saveNavState('/' + subItem.path)">
              <template slot="title">
              <!-- 图标 -->
              <i class="el-icon-menu"></i>
              <!-- 文本 -->
              <span>{{ subItem.authName }}</span>
            </template>
            </el-menu-item>
          </el-submenu>
        </el-menu>
      </el-aside>
      <!-- 右侧内容主体 :width="isCollapse ? '64px' : '200px'"-->
      <el-main v-if="isCollapse" style="margin-left:64px">
        <!-- 路由占位符 -->
        <router-view></router-view>
      </el-main>
      <el-main v-else style="margin-left:200px">
        <!-- 路由占位符 -->
        <router-view></router-view>
      </el-main>
    </el-container>
  </el-container>
</template>

<script>
import axios from 'axios'
export default {
  name: 'Home',
  data () {
    return {
      menuList: [],
      // 侧边栏一级菜单icon
      iconsObj: {
        '125': 'iconfont iconusers',
        '103': 'iconfont icontijikongjian',
        '101': 'iconfont iconshangpin',
        '102': 'iconfont icondanju',
        '145': 'iconfont iconbaobiao'
      },
      // 是否折叠
      isCollapse: false,
      // 被激活的链接地址
      activePath: ''
    }
  },
  created() {
    this.getMenuList()
    this.activePath = window.sessionStorage.getItem('activePath')
  },
  methods: {
    logout () {
      window.sessionStorage.clear()
      this.$router.push('/login')
    },
    async getMenuList () {
      const {data: res} = await axios.get('menus')
      if (res.meta.status !== 200) return this.$message.error(res.meta.msg)
      this.menuList = res.data
      // console.log(res)
    },
    // 点击按钮切换菜单的折叠与展开
    toggleCollapse() {
      this.isCollapse = !this.isCollapse
    },
    // 保存链接的激活状态
    saveNavState (activePath) {
      window.sessionStorage.setItem('activePath', activePath)
      this.activePath = activePath
    }
  }
}
</script>

<style lang="less" scoped>
.home-container {
  height: 100%;
  position: relative;
}
.el-header {
  background: #373d41;
  display: flex;
  justify-content: space-between;
  padding-left: 0;
  align-items: center;
  color: #fff;
  font-size: 20px;
  // 固定定位----index
  position: fixed;
  width: 100%;
  top: 0;
  bottom: 0;
  right: 0;
  left: 0;
  z-index: 10;
  > div {
    display: flex;
    align-items: center;
    img {
      width: 50px;
      height: 50px;
      border-radius: 50%;
    }
    span {
      margin-left: 15px;
    }
  }
}
// 侧边栏
.el-aside {
  background: #333744;
  // 固定定位
  position: fixed;
  height: 100%;
  z-index: 9;
  .el-menu {
    border-right: none;
  }
}
.el-main {
  background: #eaedea;
}
.iconfont {
  margin-right: 10px;
}
.toggle-button {
  background: #4A5064;
  font-size: 10px;
  line-height: 24px;
  color: #fff;
  text-align: center;
  letter-spacing: 0.2em;
  cursor: pointer;
}
</style>
